I noticed that wget only support domain names entries into no_proxy
env-var, i think will be good to add support for IPs and IP ranges.

Let me just remind everyone that a very common setup for people behind
proxies like in large companies, is to not resolve "outer" host names
at all or even to resolve them to other (wildcard style) addresses.

Yes it's happen also happen that big companies have hostnames with the
same domain extarnal/internal for that is useful to have subnets in
no_proxy instead of domain wildcard.

Also relevant: by resolving target host names on the host you're
leaking info to the local DNS server etc which host names you're
actually going to ask the proxy for.